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P6 5 marks Question
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TOPIC: P6 5 marks Question
#3975
P6 5 marks Question 1 Year, 6 Months ago Karma: 0
I need help in this question!!
Question :
Mary had some $5 and $10 notes in her wallet. There was a total of 60 pieces of notes at first. She used half of the number of $5 notes and received another twelve $10 notes from her mother. After that, the number of $10 notes she had was 2/3 of the remaining number of $5 notes she had left. How much money did she have at first?
Jeslyn Lam
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#3988
P6 Maths 1 Year, 6 Months ago Karma: 43
Jeslyn Lam wrote:
Mary had some $5 and $10 notes in her wallet. There was a total of 60 pieces of notes at first. She used half of the number of $5 notes and received another twelve $10 notes from her mother. After that, the number of $10 notes she had was 2/3 of the remaining number of $5 notes she had left. How much money did she have at first?
Assume the number of $5 notes be n

Before
$5 : $10
n : 60-n

Change
$5 : $10
-0.5n : +12

After
$5 : $10
3 : 2

2(n-0.5n)=3(60-n+12)
2(0.5n)=3(72-n)
n=216-3n
4n=216
n=54

At first
Value of $5 notes = nx$5=54x$5 = $270
Value of $10 notes = (60-n)x$10=6x$10 = $60
Total value of money that Mary had at first = $(270+60)= $330
Perseverance
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#3993
Re:P6 5 marks Question 1 Year, 6 Months ago Karma: 5
Alternative solution

mathmerized
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